CVE-2026-74949
published 2026-08-18CVE-2026-74949: Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.31%
23.5th percentile
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 140.14.0 | 140.14.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 141.0.0 < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 140.14 | Firefox ESR 140.14 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < Thunderbird 140.14 | Thunderbird 140.14 |
| mozilla | thunderbird | < 140.14.0 | 140.14.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.1.0 | 153.1.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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Red Hat
firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
vendor_redhat·2026-08-18·CVSS 8.8
CVE-2026-74949 [HIGH] CWE-787 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation due to use-after-free in the Graphics: Canvas2D component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: thunderbird (Red H
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74949
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74949
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-76: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-76: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-76
CVE: CVE-2026-74949
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.14
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74949
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74949
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-79: CVE-2026-74949
vendor_mozilla
CVE-2026-74949 Mozilla Foundation Security Advisory 2026-79: CVE-2026-74949
Mozilla Foundation Security Advisory 2026-79
CVE: CVE-2026-74949
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.14
GHSA
Privilege escalation due to use-after-free in the Graphics: Canvas2D component.
ghsa_unreviewed·2026-08-18
CVE-2026-74949 [HIGH] CWE-416 Privilege escalation due to use-after-free in the Graphics: Canvas2D component.
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
blogs_hackernews·2026-08-24
CVE-2026-19478 ⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
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## ⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
A package gets installed. A login prompt opens. A box sits exposed to the internet. Nothing looks unusual yet.
That’s roughly the mood this week. Trusted tools turn hostile, old weak spots get fresh attention, AI makes exploit work cheaper, and researchers keep finding attacks that sound harder than they actually are.
Plenty to clean up. Here’s the short version.
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Bugzilla
CVE-2026-74949 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
bugzilla·2026-08-18·CVSS 8.8
CVE-2026-74949 [HIGH] CVE-2026-74949 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
CVE-2026-74949 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
https://bugzilla.mozilla.org/show_bug.cgi?id=2060245https://www.mozilla.org/security/advisories/mfsa2026-74/https://www.mozilla.org/security/advisories/mfsa2026-76/https://www.mozilla.org/security/advisories/mfsa2026-77/https://www.mozilla.org/security/advisories/mfsa2026-78/https://www.mozilla.org/security/advisories/mfsa2026-79/https://www.mozilla.org/security/advisories/mfsa2026-80/
2026-08-18
Published